2. n. [Well Completions]. A downhole tool that is used to impart a heavy blow or impact load to a downhole tool assembly. Commonly used in fishing operations to free stuck objects, jars are available in a range of sizes and capacities to deliver upward or downward impact loads.
Hypnosis is a mental state (state theory) or set of attitudes (nonstate theory) usually induced by a procedure known as a hypnotic induction, which is commonly composed of a series of preliminary instructions and suggestions. hypnotic procedure is used to encourage and evaluate responses to suggestions. When using hypnosis, one person (the subject) is guided by another (the hypnotist) to respond to suggestions for changes in subjective experience, alterations in perception, sensation, emotion, thought or behavior.
Hypnosis, a method by which to induce extreme relaxation, can be employed to treat sleep disorders. Some people associate hypnosis with stage acts or television programs they've seen where people who were supposedly hypnotized acted like chickens or did other bizarre things simply because they were told to do them by the hypnotist.